Almost always the first mod done to any Z32. Fits TTs and NAs. The velocity stack helps smooth and force air into the intake system. Good for 5-10 HP on NAs and 15+ HP on Turbos! Made from cotton gauze that allows it to be cleaned and re-oiled.
If you're installing a Single POP, or Dual POP, you will need venturi's for each filter. You can purchase a replacement filter without a venturi above.